Originally Posted by chandoliasnikos
Maybe a silly question, but have you wiped cache and dalvik cache from recovery? If not try it.
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This seems quite sinisiter - thanks for the suggestion but it hasn't worked, and it's unearthed something more concerning about the state of my phone (the TWRP messages, see below). Can't believe I didn't think to do that myself though! (I haven't messed around with ROMs for quite a while so am out of practice, I've had this one for a few months).
Delvik cache completed, then said something like "updating partition details. E: Error opening '/data/system/...." I/O Error" and various APKs - one of which was system UI. Wiping the cache again told me done, but loads of errors of similar APKs (This time in /data/data/ though). This sounds incredibly ominous though and I've never seen that error before in any of the wipes or anything I've done.
Restarted it but the system UI error messages persist. I want to wipe and install a fresh ROM but I'm worried I'm going to be left with a totally useless phone if things won't wipe or flash properly. Any ideas would be great.